| Title | Recent Advances in Video Coding Using Static Background Models |
| Author | Andreas Krutz, Alexander Glantz, Thomas Sikora (Technische Universität Berlin, Germany) |
| Page | pp. 462 - 465 |
| Keyword | Video Coding, Model-based Video Coding, H.264/AVC |
| Abstract | Sprite coding, as standardized in MPEG-4 Visual, can result in superior performance compared to common hybrid video codecs both objectively and subjectively. However, state-ofthe- art video coding standard H.264/AVC clearly outperforms MPEG-4 Visual sprite coding in broad bit rate ranges. Based on the sprite coding idea, this paper proposes a video coding technique that merges the advantages of H.264/AVC and sprite coding. For that, sophisticated algorithms for global motion estimation, sprite generation and object segmentation – all needed for thorough sprite coding – are incorporated into an H.264/AVC coding environment. The proposed approach outperforms H.264/AVC especially in lower bit rate ranges. Savings up to 21% can be achieved. |
| Title | Novel Video Coding Paradigm with Reduction/Restoration Processes |
| Author | Toshie Misu, Yasutaka Matsuo, Shinichi Sakaida, Yoshiaki Shishikui, Eisuke Nakasu (Science & Technology Research Laboratories, NHK, Japan) |
| Page | pp. 466 - 469 |
| Keyword | video coding, super-resolution, image reduction, image restoration, nonuniform sampling |
| Abstract | To optimally design distortions in lossy video coding, we propose the use of a novel coding paradigm with adaptive nonlinear transforms as pre/post-processors of a conventional video codec. The preprocessor decimates less important pixels based on an image analysis. A conventional video encoder such as MPEG-4 AVC/H.264 further eliminates the redundancy of the decimated images. On the decoder side, the postprocessor restores small decoded images of the conventional decoder to the original resolution using an inverse mapping including a super-resolution technique that uses a priori knowledge on the decimation in the preprocessing. Results of the experiments showed the proposed coding scheme poses distortion that has a more straightforward appearance than that of a directly encoded/decoded image by a sole conventional H.264 codec. |
| Title | Towards Efficient Intra Prediction Based on Image Inpainting Methods |
| Author | Dimitar Doshkov, Patrick Ndjiki-Nya, Haricharan Lakshman, Martin Koeppel, Thomas Wiegand (Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, Germany) |
| Page | pp. 470 - 473 |
| Keyword | Intra prediction, Texture synthesis, PDEs, Template matching, Inpainting |
| Abstract | In this paper, novel intra prediction methods based on image inpainting approaches are proposed. The H.264/AVC intra prediction modes are not well suited for processing complex textures at low bit rates. Our algorithm utilizes an efficient combination of partial differential equations (PDEs) and patch based texture synthesis in addition to the standard directional predictors. Bit rate savings up to 3.5% compared to that of the H.264/AVC standard are shown. |
| Title | Low Complexity Video Coding and the Emerging HEVC Standard |
| Author | Kemal Ugur (Nokia Research Center, Finland), Kenneth Andersson (Ericsson Research, Sweden), Arild Fuldseth, Gisle Bjontegaard, Lars Peter Enderssen (Tandberg Telecom (Cisco), Norway), Jani Lainema, Antti Hallapuro, Dmytro Rusanovskyy, Cixun Zhang (Nokia Research Center, Finland), Andrey Norkin, Clinton Priddle, Thomas Rusert, Jonatan Samuelsson, Rickard Sjoberg, Zhuangfei Wu (Ericsson Research, Sweden), Justin Ridge (Nokia, U.S.A.) |
| Page | pp. 474 - 477 |
| Keyword | HEVC, standardization, video coding, H.264/AVC |
| Abstract | This paper describes a low complexity video codec with high coding efficiency. It was proposed to the High Efficiency Video Coding (HEVC) standardization effort of MPEG and VCEG, and has been partially adopted into the initial HEVC Test Model under Consideration design. The proposal utilizes a quad-tree structure with a support of large macroblocks of size 64x64 and 32x32, in addition to macroblocks of size 16x16. The entropy coding is done using a low complexity variable length coding based scheme with improved context adaptation over the H.264/AVC design. In addition, the proposal includes improved interpolation and deblocking filters, giving better coding efficiency while having low complexity. Finally, an improved intra coding method is presented. The subjective quality of the proposal is evaluated extensively and the results show that the proposed method achieves similar visual quality as H.264/AVC High Profile anchors with around 50% and 35% bit rate reduction for low delay and random-access experiments respectively at high definition sequences. This is achieved with less complexity than H.264/AVC Baseline Profile, making the proposal especially suitable for resource constrained environments. |